How to extract values from list and map columns?

Extract from List and Map

DataPrep supports Map and List data types . A Map is also known as the Object data type and the List is also known as an Array.

DataPrep offers extraction of data from the list and map columns using the options:
  1. Extract from List
  2. Extract from Map

To extract data from a  List

1. Right-click the List column and select the option  Extract from List  option. 

2. In the  Transform  panel select an option under the  Convert list items to section.

3. If you have selected  Columns , enter the index of the items in the list to be extracted into columns. 

4. If you have selected the  Rows  option under  Convert list items to  section, you can directly convert the array items in the list to rows in the new column. 

5. Click Apply

To extract data from a Map

1. Right-click the Map column and select the  Extract from Map  option. 

2. In the Transform panel select the keys that need to be extracted into columns. 

3. Enter the column names against the keys, so that the values of each key is mapped to the respective column. 

4. Click  Apply

Note : You can use these operations repeatedly to deal with JSON data that has nested data structures, such as a list of maps or list of lists.


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